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<pre><span class="sourceLineNo">001</span>/*<a name="line.1"></a>
<span class="sourceLineNo">002</span> * Licensed to the Apache Software Foundation (ASF) under one or more<a name="line.2"></a>
<span class="sourceLineNo">003</span> * contributor license agreements.  See the NOTICE file distributed with<a name="line.3"></a>
<span class="sourceLineNo">004</span> * this work for additional information regarding copyright ownership.<a name="line.4"></a>
<span class="sourceLineNo">005</span> * The ASF licenses this file to You under the Apache License, Version 2.0<a name="line.5"></a>
<span class="sourceLineNo">006</span> * (the "License"); you may not use this file except in compliance with<a name="line.6"></a>
<span class="sourceLineNo">007</span> * the License.  You may obtain a copy of the License at<a name="line.7"></a>
<span class="sourceLineNo">008</span> *<a name="line.8"></a>
<span class="sourceLineNo">009</span> *      http://www.apache.org/licenses/LICENSE-2.0<a name="line.9"></a>
<span class="sourceLineNo">010</span> *<a name="line.10"></a>
<span class="sourceLineNo">011</span> * Unless required by applicable law or agreed to in writing, software<a name="line.11"></a>
<span class="sourceLineNo">012</span> * distributed under the License is distributed on an "AS IS" BASIS,<a name="line.12"></a>
<span class="sourceLineNo">013</span> * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.<a name="line.13"></a>
<span class="sourceLineNo">014</span> * See the License for the specific language governing permissions and<a name="line.14"></a>
<span class="sourceLineNo">015</span> * limitations under the License.<a name="line.15"></a>
<span class="sourceLineNo">016</span> */<a name="line.16"></a>
<span class="sourceLineNo">017</span>package org.apache.commons.pool2.impl;<a name="line.17"></a>
<span class="sourceLineNo">018</span><a name="line.18"></a>
<span class="sourceLineNo">019</span>import java.time.Duration;<a name="line.19"></a>
<span class="sourceLineNo">020</span>import java.util.ArrayList;<a name="line.20"></a>
<span class="sourceLineNo">021</span>import java.util.Deque;<a name="line.21"></a>
<span class="sourceLineNo">022</span>import java.util.HashMap;<a name="line.22"></a>
<span class="sourceLineNo">023</span>import java.util.Iterator;<a name="line.23"></a>
<span class="sourceLineNo">024</span>import java.util.List;<a name="line.24"></a>
<span class="sourceLineNo">025</span>import java.util.Map;<a name="line.25"></a>
<span class="sourceLineNo">026</span>import java.util.Map.Entry;<a name="line.26"></a>
<span class="sourceLineNo">027</span>import java.util.NoSuchElementException;<a name="line.27"></a>
<span class="sourceLineNo">028</span>import java.util.Objects;<a name="line.28"></a>
<span class="sourceLineNo">029</span>import java.util.TreeMap;<a name="line.29"></a>
<span class="sourceLineNo">030</span>import java.util.concurrent.ConcurrentHashMap;<a name="line.30"></a>
<span class="sourceLineNo">031</span>import java.util.concurrent.TimeUnit;<a name="line.31"></a>
<span class="sourceLineNo">032</span>import java.util.concurrent.atomic.AtomicInteger;<a name="line.32"></a>
<span class="sourceLineNo">033</span>import java.util.concurrent.atomic.AtomicLong;<a name="line.33"></a>
<span class="sourceLineNo">034</span>import java.util.concurrent.locks.Lock;<a name="line.34"></a>
<span class="sourceLineNo">035</span>import java.util.concurrent.locks.ReadWriteLock;<a name="line.35"></a>
<span class="sourceLineNo">036</span>import java.util.concurrent.locks.ReentrantReadWriteLock;<a name="line.36"></a>
<span class="sourceLineNo">037</span>import java.util.stream.Collectors;<a name="line.37"></a>
<span class="sourceLineNo">038</span><a name="line.38"></a>
<span class="sourceLineNo">039</span>import org.apache.commons.pool2.DestroyMode;<a name="line.39"></a>
<span class="sourceLineNo">040</span>import org.apache.commons.pool2.KeyedObjectPool;<a name="line.40"></a>
<span class="sourceLineNo">041</span>import org.apache.commons.pool2.KeyedPooledObjectFactory;<a name="line.41"></a>
<span class="sourceLineNo">042</span>import org.apache.commons.pool2.PoolUtils;<a name="line.42"></a>
<span class="sourceLineNo">043</span>import org.apache.commons.pool2.PooledObject;<a name="line.43"></a>
<span class="sourceLineNo">044</span>import org.apache.commons.pool2.PooledObjectState;<a name="line.44"></a>
<span class="sourceLineNo">045</span>import org.apache.commons.pool2.SwallowedExceptionListener;<a name="line.45"></a>
<span class="sourceLineNo">046</span>import org.apache.commons.pool2.UsageTracking;<a name="line.46"></a>
<span class="sourceLineNo">047</span><a name="line.47"></a>
<span class="sourceLineNo">048</span>/**<a name="line.48"></a>
<span class="sourceLineNo">049</span> * A configurable {@code KeyedObjectPool} implementation.<a name="line.49"></a>
<span class="sourceLineNo">050</span> * &lt;p&gt;<a name="line.50"></a>
<span class="sourceLineNo">051</span> * When coupled with the appropriate {@link KeyedPooledObjectFactory},<a name="line.51"></a>
<span class="sourceLineNo">052</span> * {@code GenericKeyedObjectPool} provides robust pooling functionality for<a name="line.52"></a>
<span class="sourceLineNo">053</span> * keyed objects. A {@code GenericKeyedObjectPool} can be viewed as a map<a name="line.53"></a>
<span class="sourceLineNo">054</span> * of sub-pools, keyed on the (unique) key values provided to the<a name="line.54"></a>
<span class="sourceLineNo">055</span> * {@link #preparePool preparePool}, {@link #addObject addObject} or<a name="line.55"></a>
<span class="sourceLineNo">056</span> * {@link #borrowObject borrowObject} methods. Each time a new key value is<a name="line.56"></a>
<span class="sourceLineNo">057</span> * provided to one of these methods, a sub-new pool is created under the given<a name="line.57"></a>
<span class="sourceLineNo">058</span> * key to be managed by the containing {@code GenericKeyedObjectPool.}<a name="line.58"></a>
<span class="sourceLineNo">059</span> * &lt;/p&gt;<a name="line.59"></a>
<span class="sourceLineNo">060</span> * &lt;p&gt;<a name="line.60"></a>
<span class="sourceLineNo">061</span> * Note that the current implementation uses a ConcurrentHashMap which uses<a name="line.61"></a>
<span class="sourceLineNo">062</span> * equals() to compare keys.<a name="line.62"></a>
<span class="sourceLineNo">063</span> * This means that distinct instance keys must be distinguishable using equals.<a name="line.63"></a>
<span class="sourceLineNo">064</span> * &lt;/p&gt;<a name="line.64"></a>
<span class="sourceLineNo">065</span> * &lt;p&gt;<a name="line.65"></a>
<span class="sourceLineNo">066</span> * Optionally, one may configure the pool to examine and possibly evict objects<a name="line.66"></a>
<span class="sourceLineNo">067</span> * as they sit idle in the pool and to ensure that a minimum number of idle<a name="line.67"></a>
<span class="sourceLineNo">068</span> * objects is maintained for each key. This is performed by an "idle object<a name="line.68"></a>
<span class="sourceLineNo">069</span> * eviction" thread, which runs asynchronously. Caution should be used when<a name="line.69"></a>
<span class="sourceLineNo">070</span> * configuring this optional feature. Eviction runs contend with client threads<a name="line.70"></a>
<span class="sourceLineNo">071</span> * for access to objects in the pool, so if they run too frequently performance<a name="line.71"></a>
<span class="sourceLineNo">072</span> * issues may result.<a name="line.72"></a>
<span class="sourceLineNo">073</span> * &lt;/p&gt;<a name="line.73"></a>
<span class="sourceLineNo">074</span> * &lt;p&gt;<a name="line.74"></a>
<span class="sourceLineNo">075</span> * Implementation note: To prevent possible deadlocks, care has been taken to<a name="line.75"></a>
<span class="sourceLineNo">076</span> * ensure that no call to a factory method will occur within a synchronization<a name="line.76"></a>
<span class="sourceLineNo">077</span> * block. See POOL-125 and DBCP-44 for more information.<a name="line.77"></a>
<span class="sourceLineNo">078</span> * &lt;/p&gt;<a name="line.78"></a>
<span class="sourceLineNo">079</span> * &lt;p&gt;<a name="line.79"></a>
<span class="sourceLineNo">080</span> * This class is intended to be thread-safe.<a name="line.80"></a>
<span class="sourceLineNo">081</span> * &lt;/p&gt;<a name="line.81"></a>
<span class="sourceLineNo">082</span> *<a name="line.82"></a>
<span class="sourceLineNo">083</span> * @see GenericObjectPool<a name="line.83"></a>
<span class="sourceLineNo">084</span> *<a name="line.84"></a>
<span class="sourceLineNo">085</span> * @param &lt;K&gt; The type of keys maintained by this pool.<a name="line.85"></a>
<span class="sourceLineNo">086</span> * @param &lt;T&gt; Type of element pooled in this pool.<a name="line.86"></a>
<span class="sourceLineNo">087</span> *<a name="line.87"></a>
<span class="sourceLineNo">088</span> * @since 2.0<a name="line.88"></a>
<span class="sourceLineNo">089</span> */<a name="line.89"></a>
<span class="sourceLineNo">090</span>public class GenericKeyedObjectPool&lt;K, T&gt; extends BaseGenericObjectPool&lt;T&gt;<a name="line.90"></a>
<span class="sourceLineNo">091</span>        implements KeyedObjectPool&lt;K, T&gt;, GenericKeyedObjectPoolMXBean&lt;K&gt;, UsageTracking&lt;T&gt; {<a name="line.91"></a>
<span class="sourceLineNo">092</span><a name="line.92"></a>
<span class="sourceLineNo">093</span>    private static final Integer ZERO = Integer.valueOf(0);<a name="line.93"></a>
<span class="sourceLineNo">094</span><a name="line.94"></a>
<span class="sourceLineNo">095</span>    /**<a name="line.95"></a>
<span class="sourceLineNo">096</span>     * Maintains information on the per key queue for a given key.<a name="line.96"></a>
<span class="sourceLineNo">097</span>     *<a name="line.97"></a>
<span class="sourceLineNo">098</span>     * @param &lt;S&gt; type of objects in the pool<a name="line.98"></a>
<span class="sourceLineNo">099</span>     */<a name="line.99"></a>
<span class="sourceLineNo">100</span>    private class ObjectDeque&lt;S&gt; {<a name="line.100"></a>
<span class="sourceLineNo">101</span><a name="line.101"></a>
<span class="sourceLineNo">102</span>        private final LinkedBlockingDeque&lt;PooledObject&lt;S&gt;&gt; idleObjects;<a name="line.102"></a>
<span class="sourceLineNo">103</span><a name="line.103"></a>
<span class="sourceLineNo">104</span>        /*<a name="line.104"></a>
<span class="sourceLineNo">105</span>         * Number of instances created - number destroyed.<a name="line.105"></a>
<span class="sourceLineNo">106</span>         * Invariant: createCount &lt;= maxTotalPerKey<a name="line.106"></a>
<span class="sourceLineNo">107</span>         */<a name="line.107"></a>
<span class="sourceLineNo">108</span>        private final AtomicInteger createCount = new AtomicInteger(0);<a name="line.108"></a>
<span class="sourceLineNo">109</span><a name="line.109"></a>
<span class="sourceLineNo">110</span>        private long makeObjectCount;<a name="line.110"></a>
<span class="sourceLineNo">111</span>        private final Object makeObjectCountLock = new Object();<a name="line.111"></a>
<span class="sourceLineNo">112</span><a name="line.112"></a>
<span class="sourceLineNo">113</span>        /*<a name="line.113"></a>
<span class="sourceLineNo">114</span>         * The map is keyed on pooled instances, wrapped to ensure that<a name="line.114"></a>
<span class="sourceLineNo">115</span>         * they work properly as keys.<a name="line.115"></a>
<span class="sourceLineNo">116</span>         */<a name="line.116"></a>
<span class="sourceLineNo">117</span>        private final Map&lt;IdentityWrapper&lt;S&gt;, PooledObject&lt;S&gt;&gt; allObjects =<a name="line.117"></a>
<span class="sourceLineNo">118</span>                new ConcurrentHashMap&lt;&gt;();<a name="line.118"></a>
<span class="sourceLineNo">119</span><a name="line.119"></a>
<span class="sourceLineNo">120</span>        /*<a name="line.120"></a>
<span class="sourceLineNo">121</span>         * Number of threads with registered interest in this key.<a name="line.121"></a>
<span class="sourceLineNo">122</span>         * register(K) increments this counter and deRegister(K) decrements it.<a name="line.122"></a>
<span class="sourceLineNo">123</span>         * Invariant: empty keyed pool will not be dropped unless numInterested<a name="line.123"></a>
<span class="sourceLineNo">124</span>         *            is 0.<a name="line.124"></a>
<span class="sourceLineNo">125</span>         */<a name="line.125"></a>
<span class="sourceLineNo">126</span>        private final AtomicLong numInterested = new AtomicLong();<a name="line.126"></a>
<span class="sourceLineNo">127</span><a name="line.127"></a>
<span class="sourceLineNo">128</span>        /**<a name="line.128"></a>
<span class="sourceLineNo">129</span>         * Constructs a new ObjecDeque with the given fairness policy.<a name="line.129"></a>
<span class="sourceLineNo">130</span>         * @param fairness true means client threads waiting to borrow / return instances<a name="line.130"></a>
<span class="sourceLineNo">131</span>         * will be served as if waiting in a FIFO queue.<a name="line.131"></a>
<span class="sourceLineNo">132</span>         */<a name="line.132"></a>
<span class="sourceLineNo">133</span>        public ObjectDeque(final boolean fairness) {<a name="line.133"></a>
<span class="sourceLineNo">134</span>            idleObjects = new LinkedBlockingDeque&lt;&gt;(fairness);<a name="line.134"></a>
<span class="sourceLineNo">135</span>        }<a name="line.135"></a>
<span class="sourceLineNo">136</span><a name="line.136"></a>
<span class="sourceLineNo">137</span>        /**<a name="line.137"></a>
<span class="sourceLineNo">138</span>         * Gets all the objects for the current key.<a name="line.138"></a>
<span class="sourceLineNo">139</span>         *<a name="line.139"></a>
<span class="sourceLineNo">140</span>         * @return All the objects<a name="line.140"></a>
<span class="sourceLineNo">141</span>         */<a name="line.141"></a>
<span class="sourceLineNo">142</span>        public Map&lt;IdentityWrapper&lt;S&gt;, PooledObject&lt;S&gt;&gt; getAllObjects() {<a name="line.142"></a>
<span class="sourceLineNo">143</span>            return allObjects;<a name="line.143"></a>
<span class="sourceLineNo">144</span>        }<a name="line.144"></a>
<span class="sourceLineNo">145</span><a name="line.145"></a>
<span class="sourceLineNo">146</span>        /**<a name="line.146"></a>
<span class="sourceLineNo">147</span>         * Gets the count of the number of objects created for the current<a name="line.147"></a>
<span class="sourceLineNo">148</span>         * key.<a name="line.148"></a>
<span class="sourceLineNo">149</span>         *<a name="line.149"></a>
<span class="sourceLineNo">150</span>         * @return The number of objects created for this key<a name="line.150"></a>
<span class="sourceLineNo">151</span>         */<a name="line.151"></a>
<span class="sourceLineNo">152</span>        public AtomicInteger getCreateCount() {<a name="line.152"></a>
<span class="sourceLineNo">153</span>            return createCount;<a name="line.153"></a>
<span class="sourceLineNo">154</span>        }<a name="line.154"></a>
<span class="sourceLineNo">155</span><a name="line.155"></a>
<span class="sourceLineNo">156</span>        /**<a name="line.156"></a>
<span class="sourceLineNo">157</span>         * Gets the idle objects for the current key.<a name="line.157"></a>
<span class="sourceLineNo">158</span>         *<a name="line.158"></a>
<span class="sourceLineNo">159</span>         * @return The idle objects<a name="line.159"></a>
<span class="sourceLineNo">160</span>         */<a name="line.160"></a>
<span class="sourceLineNo">161</span>        public LinkedBlockingDeque&lt;PooledObject&lt;S&gt;&gt; getIdleObjects() {<a name="line.161"></a>
<span class="sourceLineNo">162</span>            return idleObjects;<a name="line.162"></a>
<span class="sourceLineNo">163</span>        }<a name="line.163"></a>
<span class="sourceLineNo">164</span><a name="line.164"></a>
<span class="sourceLineNo">165</span>        /**<a name="line.165"></a>
<span class="sourceLineNo">166</span>         * Gets the number of threads with an interest registered in this key.<a name="line.166"></a>
<span class="sourceLineNo">167</span>         *<a name="line.167"></a>
<span class="sourceLineNo">168</span>         * @return The number of threads with a registered interest in this key<a name="line.168"></a>
<span class="sourceLineNo">169</span>         */<a name="line.169"></a>
<span class="sourceLineNo">170</span>        public AtomicLong getNumInterested() {<a name="line.170"></a>
<span class="sourceLineNo">171</span>            return numInterested;<a name="line.171"></a>
<span class="sourceLineNo">172</span>        }<a name="line.172"></a>
<span class="sourceLineNo">173</span><a name="line.173"></a>
<span class="sourceLineNo">174</span>        @Override<a name="line.174"></a>
<span class="sourceLineNo">175</span>        public String toString() {<a name="line.175"></a>
<span class="sourceLineNo">176</span>            final StringBuilder builder = new StringBuilder();<a name="line.176"></a>
<span class="sourceLineNo">177</span>            builder.append("ObjectDeque [idleObjects=");<a name="line.177"></a>
<span class="sourceLineNo">178</span>            builder.append(idleObjects);<a name="line.178"></a>
<span class="sourceLineNo">179</span>            builder.append(", createCount=");<a name="line.179"></a>
<span class="sourceLineNo">180</span>            builder.append(createCount);<a name="line.180"></a>
<span class="sourceLineNo">181</span>            builder.append(", allObjects=");<a name="line.181"></a>
<span class="sourceLineNo">182</span>            builder.append(allObjects);<a name="line.182"></a>
<span class="sourceLineNo">183</span>            builder.append(", numInterested=");<a name="line.183"></a>
<span class="sourceLineNo">184</span>            builder.append(numInterested);<a name="line.184"></a>
<span class="sourceLineNo">185</span>            builder.append("]");<a name="line.185"></a>
<span class="sourceLineNo">186</span>            return builder.toString();<a name="line.186"></a>
<span class="sourceLineNo">187</span>        }<a name="line.187"></a>
<span class="sourceLineNo">188</span><a name="line.188"></a>
<span class="sourceLineNo">189</span>    }<a name="line.189"></a>
<span class="sourceLineNo">190</span><a name="line.190"></a>
<span class="sourceLineNo">191</span>    // JMX specific attributes<a name="line.191"></a>
<span class="sourceLineNo">192</span>    private static final String ONAME_BASE =<a name="line.192"></a>
<span class="sourceLineNo">193</span>            "org.apache.commons.pool2:type=GenericKeyedObjectPool,name=";<a name="line.193"></a>
<span class="sourceLineNo">194</span><a name="line.194"></a>
<span class="sourceLineNo">195</span>    //--- configuration attributes ---------------------------------------------<a name="line.195"></a>
<span class="sourceLineNo">196</span>    private volatile int maxIdlePerKey =<a name="line.196"></a>
<span class="sourceLineNo">197</span>            GenericKeyedObjectPoolConfig.DEFAULT_MAX_IDLE_PER_KEY;<a name="line.197"></a>
<span class="sourceLineNo">198</span><a name="line.198"></a>
<span class="sourceLineNo">199</span>    private volatile int minIdlePerKey =<a name="line.199"></a>
<span class="sourceLineNo">200</span>            GenericKeyedObjectPoolConfig.DEFAULT_MIN_IDLE_PER_KEY;<a name="line.200"></a>
<span class="sourceLineNo">201</span><a name="line.201"></a>
<span class="sourceLineNo">202</span><a name="line.202"></a>
<span class="sourceLineNo">203</span>    private volatile int maxTotalPerKey =<a name="line.203"></a>
<span class="sourceLineNo">204</span>            GenericKeyedObjectPoolConfig.DEFAULT_MAX_TOTAL_PER_KEY;<a name="line.204"></a>
<span class="sourceLineNo">205</span><a name="line.205"></a>
<span class="sourceLineNo">206</span>    private final KeyedPooledObjectFactory&lt;K, T&gt; factory;<a name="line.206"></a>
<span class="sourceLineNo">207</span><a name="line.207"></a>
<span class="sourceLineNo">208</span>    private final boolean fairness;<a name="line.208"></a>
<span class="sourceLineNo">209</span><a name="line.209"></a>
<span class="sourceLineNo">210</span>    /*<a name="line.210"></a>
<span class="sourceLineNo">211</span>     * My hash of sub-pools (ObjectQueue). The list of keys &lt;b&gt;must&lt;/b&gt; be kept<a name="line.211"></a>
<span class="sourceLineNo">212</span>     * in step with {@link #poolKeyList} using {@link #keyLock} to ensure any<a name="line.212"></a>
<span class="sourceLineNo">213</span>     * changes to the list of current keys is made in a thread-safe manner.<a name="line.213"></a>
<span class="sourceLineNo">214</span>     */<a name="line.214"></a>
<span class="sourceLineNo">215</span>    private final Map&lt;K, ObjectDeque&lt;T&gt;&gt; poolMap =<a name="line.215"></a>
<span class="sourceLineNo">216</span>            new ConcurrentHashMap&lt;&gt;(); // @GuardedBy("keyLock") for write access (and some read access)<a name="line.216"></a>
<span class="sourceLineNo">217</span><a name="line.217"></a>
<span class="sourceLineNo">218</span>    /*<a name="line.218"></a>
<span class="sourceLineNo">219</span>     * List of pool keys - used to control eviction order. The list of keys<a name="line.219"></a>
<span class="sourceLineNo">220</span>     * &lt;b&gt;must&lt;/b&gt; be kept in step with {@link #poolMap} using {@link #keyLock}<a name="line.220"></a>
<span class="sourceLineNo">221</span>     * to ensure any changes to the list of current keys is made in a<a name="line.221"></a>
<span class="sourceLineNo">222</span>     * thread-safe manner.<a name="line.222"></a>
<span class="sourceLineNo">223</span>     */<a name="line.223"></a>
<span class="sourceLineNo">224</span>    private final List&lt;K&gt; poolKeyList = new ArrayList&lt;&gt;(); // @GuardedBy("keyLock")<a name="line.224"></a>
<span class="sourceLineNo">225</span><a name="line.225"></a>
<span class="sourceLineNo">226</span>    private final ReadWriteLock keyLock = new ReentrantReadWriteLock(true);<a name="line.226"></a>
<span class="sourceLineNo">227</span><a name="line.227"></a>
<span class="sourceLineNo">228</span>    /*<a name="line.228"></a>
<span class="sourceLineNo">229</span>     * The combined count of the currently active objects for all keys and those<a name="line.229"></a>
<span class="sourceLineNo">230</span>     * in the process of being created. Under load, it may exceed<a name="line.230"></a>
<span class="sourceLineNo">231</span>     * {@link #maxTotal} but there will never be more than {@link #maxTotal}<a name="line.231"></a>
<span class="sourceLineNo">232</span>     * created at any one time.<a name="line.232"></a>
<span class="sourceLineNo">233</span>     */<a name="line.233"></a>
<span class="sourceLineNo">234</span>    private final AtomicInteger numTotal = new AtomicInteger(0);<a name="line.234"></a>
<span class="sourceLineNo">235</span><a name="line.235"></a>
<span class="sourceLineNo">236</span>    private Iterator&lt;K&gt; evictionKeyIterator; // @GuardedBy("evictionLock")<a name="line.236"></a>
<span class="sourceLineNo">237</span><a name="line.237"></a>
<span class="sourceLineNo">238</span><a name="line.238"></a>
<span class="sourceLineNo">239</span>    private K evictionKey; // @GuardedBy("evictionLock")<a name="line.239"></a>
<span class="sourceLineNo">240</span><a name="line.240"></a>
<span class="sourceLineNo">241</span>    /**<a name="line.241"></a>
<span class="sourceLineNo">242</span>     * Constructs a new {@code GenericKeyedObjectPool} using defaults from<a name="line.242"></a>
<span class="sourceLineNo">243</span>     * {@link GenericKeyedObjectPoolConfig}.<a name="line.243"></a>
<span class="sourceLineNo">244</span>     * @param factory the factory to be used to create entries<a name="line.244"></a>
<span class="sourceLineNo">245</span>     */<a name="line.245"></a>
<span class="sourceLineNo">246</span>    public GenericKeyedObjectPool(final KeyedPooledObjectFactory&lt;K, T&gt; factory) {<a name="line.246"></a>
<span class="sourceLineNo">247</span>        this(factory, new GenericKeyedObjectPoolConfig&lt;&gt;());<a name="line.247"></a>
<span class="sourceLineNo">248</span>    }<a name="line.248"></a>
<span class="sourceLineNo">249</span><a name="line.249"></a>
<span class="sourceLineNo">250</span>    /**<a name="line.250"></a>
<span class="sourceLineNo">251</span>     * Constructs a new {@code GenericKeyedObjectPool} using a specific<a name="line.251"></a>
<span class="sourceLineNo">252</span>     * configuration.<a name="line.252"></a>
<span class="sourceLineNo">253</span>     *<a name="line.253"></a>
<span class="sourceLineNo">254</span>     * @param factory the factory to be used to create entries<a name="line.254"></a>
<span class="sourceLineNo">255</span>     * @param config    The configuration to use for this pool instance. The<a name="line.255"></a>
<span class="sourceLineNo">256</span>     *                  configuration is used by value. Subsequent changes to<a name="line.256"></a>
<span class="sourceLineNo">257</span>     *                  the configuration object will not be reflected in the<a name="line.257"></a>
<span class="sourceLineNo">258</span>     *                  pool.<a name="line.258"></a>
<span class="sourceLineNo">259</span>     */<a name="line.259"></a>
<span class="sourceLineNo">260</span>    public GenericKeyedObjectPool(final KeyedPooledObjectFactory&lt;K, T&gt; factory,<a name="line.260"></a>
<span class="sourceLineNo">261</span>            final GenericKeyedObjectPoolConfig&lt;T&gt; config) {<a name="line.261"></a>
<span class="sourceLineNo">262</span><a name="line.262"></a>
<span class="sourceLineNo">263</span>        super(config, ONAME_BASE, config.getJmxNamePrefix());<a name="line.263"></a>
<span class="sourceLineNo">264</span><a name="line.264"></a>
<span class="sourceLineNo">265</span>        if (factory == null) {<a name="line.265"></a>
<span class="sourceLineNo">266</span>            jmxUnregister(); // tidy up<a name="line.266"></a>
<span class="sourceLineNo">267</span>            throw new IllegalArgumentException("Factory may not be null");<a name="line.267"></a>
<span class="sourceLineNo">268</span>        }<a name="line.268"></a>
<span class="sourceLineNo">269</span>        this.factory = factory;<a name="line.269"></a>
<span class="sourceLineNo">270</span>        this.fairness = config.getFairness();<a name="line.270"></a>
<span class="sourceLineNo">271</span><a name="line.271"></a>
<span class="sourceLineNo">272</span>        setConfig(config);<a name="line.272"></a>
<span class="sourceLineNo">273</span>    }<a name="line.273"></a>
<span class="sourceLineNo">274</span><a name="line.274"></a>
<span class="sourceLineNo">275</span>    /**<a name="line.275"></a>
<span class="sourceLineNo">276</span>     * Creates a new {@code GenericKeyedObjectPool} that tracks and destroys<a name="line.276"></a>
<span class="sourceLineNo">277</span>     * objects that are checked out, but never returned to the pool.<a name="line.277"></a>
<span class="sourceLineNo">278</span>     *<a name="line.278"></a>
<span class="sourceLineNo">279</span>     * @param factory   The object factory to be used to create object instances<a name="line.279"></a>
<span class="sourceLineNo">280</span>     *                  used by this pool<a name="line.280"></a>
<span class="sourceLineNo">281</span>     * @param config    The base pool configuration to use for this pool instance.<a name="line.281"></a>
<span class="sourceLineNo">282</span>     *                  The configuration is used by value. Subsequent changes to<a name="line.282"></a>
<span class="sourceLineNo">283</span>     *                  the configuration object will not be reflected in the<a name="line.283"></a>
<span class="sourceLineNo">284</span>     *                  pool.<a name="line.284"></a>
<span class="sourceLineNo">285</span>     * @param abandonedConfig  Configuration for abandoned object identification<a name="line.285"></a>
<span class="sourceLineNo">286</span>     *                         and removal.  The configuration is used by value.<a name="line.286"></a>
<span class="sourceLineNo">287</span>     * @since 2.10.0<a name="line.287"></a>
<span class="sourceLineNo">288</span>     */<a name="line.288"></a>
<span class="sourceLineNo">289</span>    public GenericKeyedObjectPool(final KeyedPooledObjectFactory&lt;K, T&gt; factory,<a name="line.289"></a>
<span class="sourceLineNo">290</span>            final GenericKeyedObjectPoolConfig&lt;T&gt; config, final AbandonedConfig abandonedConfig) {<a name="line.290"></a>
<span class="sourceLineNo">291</span>        this(factory, config);<a name="line.291"></a>
<span class="sourceLineNo">292</span>        setAbandonedConfig(abandonedConfig);<a name="line.292"></a>
<span class="sourceLineNo">293</span>    }<a name="line.293"></a>
<span class="sourceLineNo">294</span><a name="line.294"></a>
<span class="sourceLineNo">295</span>    /**<a name="line.295"></a>
<span class="sourceLineNo">296</span>     * Add an object to the set of idle objects for a given key.<a name="line.296"></a>
<span class="sourceLineNo">297</span>     *<a name="line.297"></a>
<span class="sourceLineNo">298</span>     * @param key The key to associate with the idle object<a name="line.298"></a>
<span class="sourceLineNo">299</span>     * @param p The wrapped object to add.<a name="line.299"></a>
<span class="sourceLineNo">300</span>     *<a name="line.300"></a>
<span class="sourceLineNo">301</span>     * @throws Exception If the associated factory fails to passivate the object<a name="line.301"></a>
<span class="sourceLineNo">302</span>     */<a name="line.302"></a>
<span class="sourceLineNo">303</span>    private void addIdleObject(final K key, final PooledObject&lt;T&gt; p) throws Exception {<a name="line.303"></a>
<span class="sourceLineNo">304</span><a name="line.304"></a>
<span class="sourceLineNo">305</span>        if (p != null) {<a name="line.305"></a>
<span class="sourceLineNo">306</span>            factory.passivateObject(key, p);<a name="line.306"></a>
<span class="sourceLineNo">307</span>            final LinkedBlockingDeque&lt;PooledObject&lt;T&gt;&gt; idleObjects =<a name="line.307"></a>
<span class="sourceLineNo">308</span>                    poolMap.get(key).getIdleObjects();<a name="line.308"></a>
<span class="sourceLineNo">309</span>            if (getLifo()) {<a name="line.309"></a>
<span class="sourceLineNo">310</span>                idleObjects.addFirst(p);<a name="line.310"></a>
<span class="sourceLineNo">311</span>            } else {<a name="line.311"></a>
<span class="sourceLineNo">312</span>                idleObjects.addLast(p);<a name="line.312"></a>
<span class="sourceLineNo">313</span>            }<a name="line.313"></a>
<span class="sourceLineNo">314</span>        }<a name="line.314"></a>
<span class="sourceLineNo">315</span>    }<a name="line.315"></a>
<span class="sourceLineNo">316</span><a name="line.316"></a>
<span class="sourceLineNo">317</span><a name="line.317"></a>
<span class="sourceLineNo">318</span>    /**<a name="line.318"></a>
<span class="sourceLineNo">319</span>     * Create an object using the {@link KeyedPooledObjectFactory#makeObject<a name="line.319"></a>
<span class="sourceLineNo">320</span>     * factory}, passivate it, and then place it in the idle object pool.<a name="line.320"></a>
<span class="sourceLineNo">321</span>     * {@code addObject} is useful for "pre-loading" a pool with idle<a name="line.321"></a>
<span class="sourceLineNo">322</span>     * objects.<a name="line.322"></a>
<span class="sourceLineNo">323</span>     *<a name="line.323"></a>
<span class="sourceLineNo">324</span>     * @param key the key a new instance should be added to<a name="line.324"></a>
<span class="sourceLineNo">325</span>     *<a name="line.325"></a>
<span class="sourceLineNo">326</span>     * @throws Exception when {@link KeyedPooledObjectFactory#makeObject}<a name="line.326"></a>
<span class="sourceLineNo">327</span>     *                   fails.<a name="line.327"></a>
<span class="sourceLineNo">328</span>     */<a name="line.328"></a>
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<span class="sourceLineNo">330</span>    public void addObject(final K key) throws Exception {<a name="line.330"></a>
<span class="sourceLineNo">331</span>        assertOpen();<a name="line.331"></a>
<span class="sourceLineNo">332</span>        register(key);<a name="line.332"></a>
<span class="sourceLineNo">333</span>        try {<a name="line.333"></a>
<span class="sourceLineNo">334</span>            final PooledObject&lt;T&gt; p = create(key);<a name="line.334"></a>
<span class="sourceLineNo">335</span>            addIdleObject(key, p);<a name="line.335"></a>
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<span class="sourceLineNo">337</span>            deregister(key);<a name="line.337"></a>
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<span class="sourceLineNo">339</span>    }<a name="line.339"></a>
<span class="sourceLineNo">340</span><a name="line.340"></a>
<span class="sourceLineNo">341</span><a name="line.341"></a>
<span class="sourceLineNo">342</span>    /**<a name="line.342"></a>
<span class="sourceLineNo">343</span>     * Equivalent to &lt;code&gt;{@link #borrowObject(Object, long) borrowObject}(key,<a name="line.343"></a>
<span class="sourceLineNo">344</span>     * {@link #getMaxWaitDuration()})&lt;/code&gt;.<a name="line.344"></a>
<span class="sourceLineNo">345</span>     *<a name="line.345"></a>
<span class="sourceLineNo">346</span>     * {@inheritDoc}<a name="line.346"></a>
<span class="sourceLineNo">347</span>     */<a name="line.347"></a>
<span class="sourceLineNo">348</span>    @Override<a name="line.348"></a>
<span class="sourceLineNo">349</span>    public T borrowObject(final K key) throws Exception {<a name="line.349"></a>
<span class="sourceLineNo">350</span>        return borrowObject(key, getMaxWaitDuration().toMillis());<a name="line.350"></a>
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<span class="sourceLineNo">352</span><a name="line.352"></a>
<span class="sourceLineNo">353</span><a name="line.353"></a>
<span class="sourceLineNo">354</span>    /**<a name="line.354"></a>
<span class="sourceLineNo">355</span>     * Borrows an object from the sub-pool associated with the given key using<a name="line.355"></a>
<span class="sourceLineNo">356</span>     * the specified waiting time which only applies if<a name="line.356"></a>
<span class="sourceLineNo">357</span>     * {@link #getBlockWhenExhausted()} is true.<a name="line.357"></a>
<span class="sourceLineNo">358</span>     * &lt;p&gt;<a name="line.358"></a>
<span class="sourceLineNo">359</span>     * If there is one or more idle instances available in the sub-pool<a name="line.359"></a>
<span class="sourceLineNo">360</span>     * associated with the given key, then an idle instance will be selected<a name="line.360"></a>
<span class="sourceLineNo">361</span>     * based on the value of {@link #getLifo()}, activated and returned.  If<a name="line.361"></a>
<span class="sourceLineNo">362</span>     * activation fails, or {@link #getTestOnBorrow() testOnBorrow} is set to<a name="line.362"></a>
<span class="sourceLineNo">363</span>     * {@code true} and validation fails, the instance is destroyed and the<a name="line.363"></a>
<span class="sourceLineNo">364</span>     * next available instance is examined.  This continues until either a valid<a name="line.364"></a>
<span class="sourceLineNo">365</span>     * instance is returned or there are no more idle instances available.<a name="line.365"></a>
<span class="sourceLineNo">366</span>     * &lt;/p&gt;<a name="line.366"></a>
<span class="sourceLineNo">367</span>     * &lt;p&gt;<a name="line.367"></a>
<span class="sourceLineNo">368</span>     * If there are no idle instances available in the sub-pool associated with<a name="line.368"></a>
<span class="sourceLineNo">369</span>     * the given key, behavior depends on the {@link #getMaxTotalPerKey()<a name="line.369"></a>
<span class="sourceLineNo">370</span>     * maxTotalPerKey}, {@link #getMaxTotal() maxTotal}, and (if applicable)<a name="line.370"></a>
<span class="sourceLineNo">371</span>     * {@link #getBlockWhenExhausted()} and the value passed in to the<a name="line.371"></a>
<span class="sourceLineNo">372</span>     * {@code borrowMaxWaitMillis} parameter. If the number of instances checked<a name="line.372"></a>
<span class="sourceLineNo">373</span>     * out from the sub-pool under the given key is less than<a name="line.373"></a>
<span class="sourceLineNo">374</span>     * {@code maxTotalPerKey} and the total number of instances in<a name="line.374"></a>
<span class="sourceLineNo">375</span>     * circulation (under all keys) is less than {@code maxTotal}, a new<a name="line.375"></a>
<span class="sourceLineNo">376</span>     * instance is created, activated and (if applicable) validated and returned<a name="line.376"></a>
<span class="sourceLineNo">377</span>     * to the caller. If validation fails, a {@code NoSuchElementException}<a name="line.377"></a>
<span class="sourceLineNo">378</span>     * will be thrown.<a name="line.378"></a>
<span class="sourceLineNo">379</span>     * &lt;/p&gt;<a name="line.379"></a>
<span class="sourceLineNo">380</span>     * &lt;p&gt;<a name="line.380"></a>
<span class="sourceLineNo">381</span>     * If the associated sub-pool is exhausted (no available idle instances and<a name="line.381"></a>
<span class="sourceLineNo">382</span>     * no capacity to create new ones), this method will either block<a name="line.382"></a>
<span class="sourceLineNo">383</span>     * ({@link #getBlockWhenExhausted()} is true) or throw a<a name="line.383"></a>
<span class="sourceLineNo">384</span>     * {@code NoSuchElementException}<a name="line.384"></a>
<span class="sourceLineNo">385</span>     * ({@link #getBlockWhenExhausted()} is false).<a name="line.385"></a>
<span class="sourceLineNo">386</span>     * The length of time that this method will block when<a name="line.386"></a>
<span class="sourceLineNo">387</span>     * {@link #getBlockWhenExhausted()} is true is determined by the value<a name="line.387"></a>
<span class="sourceLineNo">388</span>     * passed in to the {@code borrowMaxWait} parameter.<a name="line.388"></a>
<span class="sourceLineNo">389</span>     * &lt;/p&gt;<a name="line.389"></a>
<span class="sourceLineNo">390</span>     * &lt;p&gt;<a name="line.390"></a>
<span class="sourceLineNo">391</span>     * When {@code maxTotal} is set to a positive value and this method is<a name="line.391"></a>
<span class="sourceLineNo">392</span>     * invoked when at the limit with no idle instances available under the requested<a name="line.392"></a>
<span class="sourceLineNo">393</span>     * key, an attempt is made to create room by clearing the oldest 15% of the<a name="line.393"></a>
<span class="sourceLineNo">394</span>     * elements from the keyed sub-pools.<a name="line.394"></a>
<span class="sourceLineNo">395</span>     * &lt;/p&gt;<a name="line.395"></a>
<span class="sourceLineNo">396</span>     * &lt;p&gt;<a name="line.396"></a>
<span class="sourceLineNo">397</span>     * When the pool is exhausted, multiple calling threads may be<a name="line.397"></a>
<span class="sourceLineNo">398</span>     * simultaneously blocked waiting for instances to become available. A<a name="line.398"></a>
<span class="sourceLineNo">399</span>     * "fairness" algorithm has been implemented to ensure that threads receive<a name="line.399"></a>
<span class="sourceLineNo">400</span>     * available instances in request arrival order.<a name="line.400"></a>
<span class="sourceLineNo">401</span>     * &lt;/p&gt;<a name="line.401"></a>
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<span class="sourceLineNo">405</span>     *                            to become available<a name="line.405"></a>
<span class="sourceLineNo">406</span>     *<a name="line.406"></a>
<span class="sourceLineNo">407</span>     * @return object instance from the keyed pool<a name="line.407"></a>
<span class="sourceLineNo">408</span>     *<a name="line.408"></a>
<span class="sourceLineNo">409</span>     * @throws NoSuchElementException if a keyed object instance cannot be<a name="line.409"></a>
<span class="sourceLineNo">410</span>     *                                returned because the pool is exhausted.<a name="line.410"></a>
<span class="sourceLineNo">411</span>     *<a name="line.411"></a>
<span class="sourceLineNo">412</span>     * @throws Exception if a keyed object instance cannot be returned due to an<a name="line.412"></a>
<span class="sourceLineNo">413</span>     *                   error<a name="line.413"></a>
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<span class="sourceLineNo">420</span>                (getNumActive() &gt; getMaxTotal() - 3)) {<a name="line.420"></a>
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<span class="sourceLineNo">423</span><a name="line.423"></a>
<span class="sourceLineNo">424</span>        PooledObject&lt;T&gt; p = null;<a name="line.424"></a>
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<span class="sourceLineNo">426</span>        // Get local copy of current config so it is consistent for entire<a name="line.426"></a>
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<span class="sourceLineNo">431</span>        final long waitTimeMillis = System.currentTimeMillis();<a name="line.431"></a>
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<span class="sourceLineNo">449</span>                            p = objectDeque.getIdleObjects().pollFirst(borrowMaxWaitMillis, TimeUnit.MILLISECONDS);<a name="line.449"></a>
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<span class="sourceLineNo">455</span>                    }<a name="line.455"></a>
<span class="sourceLineNo">456</span>                } else if (p == null) {<a name="line.456"></a>
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<span class="sourceLineNo">458</span>                }<a name="line.458"></a>
<span class="sourceLineNo">459</span>                if (!p.allocate()) {<a name="line.459"></a>
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<span class="sourceLineNo">462</span><a name="line.462"></a>
<span class="sourceLineNo">463</span>                if (p != null) {<a name="line.463"></a>
<span class="sourceLineNo">464</span>                    try {<a name="line.464"></a>
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<span class="sourceLineNo">466</span>                    } catch (final Exception e) {<a name="line.466"></a>
<span class="sourceLineNo">467</span>                        try {<a name="line.467"></a>
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<span class="sourceLineNo">469</span>                        } catch (final Exception e1) {<a name="line.469"></a>
<span class="sourceLineNo">470</span>                            // Ignore - activation failure is more important<a name="line.470"></a>
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<span class="sourceLineNo">472</span>                        p = null;<a name="line.472"></a>
<span class="sourceLineNo">473</span>                        if (create) {<a name="line.473"></a>
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<span class="sourceLineNo">484</span>                        } catch (final Throwable t) {<a name="line.484"></a>
<span class="sourceLineNo">485</span>                            PoolUtils.checkRethrow(t);<a name="line.485"></a>
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<span class="sourceLineNo">830</span>                    //       poolKeyList at the same time while protected by<a name="line.830"></a>
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<span class="sourceLineNo">903</span>     * the pool for the given key.<a name="line.903"></a>
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<span class="sourceLineNo">905</span>     * @param key The key to check for idle objects<a name="line.905"></a>
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<span class="sourceLineNo">907</span>     * @throws Exception If a new object is required and cannot be created<a name="line.907"></a>
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<span class="sourceLineNo">912</span><a name="line.912"></a>
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<span class="sourceLineNo">915</span><a name="line.915"></a>
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<span class="sourceLineNo">937</span>     * &lt;p&gt;<a name="line.937"></a>
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<span class="sourceLineNo">940</span>     * oldest-to-youngest order within the keyed sub-pools.<a name="line.940"></a>
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<span class="sourceLineNo">955</span>                        getSoftMinEvictableIdleDuration(),<a name="line.955"></a>
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<span class="sourceLineNo">1683</span>    private void whenWaitersAddObject(final K key, final LinkedBlockingDeque&lt;PooledObject&lt;T&gt;&gt; idleObjects) {<a name="line.1683"></a>
<span class="sourceLineNo">1684</span>        if (idleObjects.hasTakeWaiters()) {<a name="line.1684"></a>
<span class="sourceLineNo">1685</span>            try {<a name="line.1685"></a>
<span class="sourceLineNo">1686</span>                addObject(key);<a name="line.1686"></a>
<span class="sourceLineNo">1687</span>            } catch (final Exception e) {<a name="line.1687"></a>
<span class="sourceLineNo">1688</span>                swallowException(e);<a name="line.1688"></a>
<span class="sourceLineNo">1689</span>            }<a name="line.1689"></a>
<span class="sourceLineNo">1690</span>        }<a name="line.1690"></a>
<span class="sourceLineNo">1691</span>    }<a name="line.1691"></a>
<span class="sourceLineNo">1692</span><a name="line.1692"></a>
<span class="sourceLineNo">1693</span>    /**<a name="line.1693"></a>
<span class="sourceLineNo">1694</span>     * @since 2.10.0<a name="line.1694"></a>
<span class="sourceLineNo">1695</span>     */<a name="line.1695"></a>
<span class="sourceLineNo">1696</span>    @Override<a name="line.1696"></a>
<span class="sourceLineNo">1697</span>    public void use(final T pooledObject) {<a name="line.1697"></a>
<span class="sourceLineNo">1698</span>        final AbandonedConfig abandonedCfg = this.abandonedConfig;<a name="line.1698"></a>
<span class="sourceLineNo">1699</span>        if (abandonedCfg != null &amp;&amp; abandonedCfg.getUseUsageTracking()) {<a name="line.1699"></a>
<span class="sourceLineNo">1700</span>            poolMap.values().stream()<a name="line.1700"></a>
<span class="sourceLineNo">1701</span>                .map(pool -&gt; pool.getAllObjects().get(new IdentityWrapper&lt;&gt;(pooledObject)))<a name="line.1701"></a>
<span class="sourceLineNo">1702</span>                .filter(Objects::nonNull)<a name="line.1702"></a>
<span class="sourceLineNo">1703</span>                .findFirst()<a name="line.1703"></a>
<span class="sourceLineNo">1704</span>                .ifPresent(PooledObject::use);<a name="line.1704"></a>
<span class="sourceLineNo">1705</span>        }<a name="line.1705"></a>
<span class="sourceLineNo">1706</span>    }<a name="line.1706"></a>
<span class="sourceLineNo">1707</span><a name="line.1707"></a>
<span class="sourceLineNo">1708</span>}<a name="line.1708"></a>




























































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